I have a 2015 macbook (high sierra), and it's never been a champ at time machine. partly because I usually charge it at work, and at home it's used in shorter sessions on battery, sleeping without ...
My current Time Machine drive is a 4TB HDD I've been using for...probably like a decade at this point. It's been very reliable. But being an HDD, it has the obvious downsides of noise and slowness.
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